include/asm-sh64/processor.h - linux - Git at Google

 #ifndef __ASM_SH64_PROCESSOR_H
 #define __ASM_SH64_PROCESSOR_H

 /*
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  *
  * include/asm-sh64/processor.h
  *
  * Copyright (C) 2000, 2001  Paolo Alberelli
  * Copyright (C) 2003  Paul Mundt
  * Copyright (C) 2004  Richard Curnow
  *
  */

 #include <asm/page.h>

 #ifndef __ASSEMBLY__

 #include <asm/types.h>
 #include <asm/cache.h>
 #include <asm/registers.h>
 #include <linux/threads.h>
 #include <linux/compiler.h>

 /*
  * Default implementation of macro that returns current
  * instruction pointer ("program counter").
  */
 #define current_text_addr() ({ \
 void *pc; \
 unsigned long long __dummy = 0; \
 __asm__("gettr	tr0, %1\n\t" \
 	"pta	4, tr0\n\t" \
 	"gettr	tr0, %0\n\t" \
 	"ptabs	%1, tr0\n\t"	\
 	:"=r" (pc), "=r" (__dummy) \
 	: "1" (__dummy)); \
 pc; })

 /*
  *  CPU type and hardware bug flags. Kept separately for each CPU.
  */
 enum cpu_type {
 	CPU_SH5_101,
 	CPU_SH5_103,
 	CPU_SH_NONE
 };

 /*
  * TLB information structure
  *
  * Defined for both I and D tlb, per-processor.
  */
 struct tlb_info {
 	unsigned long long next;
 	unsigned long long first;
 	unsigned long long last;

 	unsigned int entries;
 	unsigned int step;

 	unsigned long flags;
 };

 struct sh_cpuinfo {
 	enum cpu_type type;
 	unsigned long loops_per_jiffy;

 	char	hard_math;

 	unsigned long *pgd_quick;
 	unsigned long *pmd_quick;
 	unsigned long *pte_quick;
 	unsigned long pgtable_cache_sz;
 	unsigned int cpu_clock, master_clock, bus_clock, module_clock;

 	/* Cache info */
 	struct cache_info icache;
 	struct cache_info dcache;

 	/* TLB info */
 	struct tlb_info itlb;
 	struct tlb_info dtlb;
 };

 extern struct sh_cpuinfo boot_cpu_data;

 #define cpu_data (&boot_cpu_data)
 #define current_cpu_data boot_cpu_data

 #endif

 /*
  * User space process size: 2GB - 4k.
  */
 #define TASK_SIZE	0x7ffff000UL

 /* This decides where the kernel will search for a free chunk of vm
  * space during mmap's.
  */
 #define TASK_UNMAPPED_BASE	(TASK_SIZE / 3)

 /*
  * Bit of SR register
  *
  * FD-bit:
  *     When it's set, it means the processor doesn't have right to use FPU,
  *     and it results exception when the floating operation is executed.
  *
  * IMASK-bit:
  *     Interrupt level mask
  *
  * STEP-bit:
  *     Single step bit
  *
  */
 #define SR_FD    0x00008000

 #if defined(CONFIG_SH64_SR_WATCH)
 #define SR_MMU   0x84000000
 #else
 #define SR_MMU   0x80000000
 #endif

 #define SR_IMASK 0x000000f0
 #define SR_SSTEP 0x08000000

 #ifndef __ASSEMBLY__

 /*
  * FPU structure and data : require 8-byte alignment as we need to access it
    with fld.p, fst.p
  */

 struct sh_fpu_hard_struct {
 	unsigned long fp_regs[64];
 	unsigned int fpscr;
 	/* long status; * software status information */
 };

 #if 0
 /* Dummy fpu emulator  */
 struct sh_fpu_soft_struct {
 	unsigned long long fp_regs[32];
 	unsigned int fpscr;
 	unsigned char lookahead;
 	unsigned long entry_pc;
 };
 #endif

 union sh_fpu_union {
 	struct sh_fpu_hard_struct hard;
 	/* 'hard' itself only produces 32 bit alignment, yet we need
 	   to access it using 64 bit load/store as well. */
 	unsigned long long alignment_dummy;
 };

 struct thread_struct {
 	unsigned long sp;
 	unsigned long pc;
 	/* This stores the address of the pt_regs built during a context
 	   switch, or of the register save area built for a kernel mode
 	   exception.  It is used for backtracing the stack of a sleeping task
 	   or one that traps in kernel mode. */
         struct pt_regs *kregs;
 	/* This stores the address of the pt_regs constructed on entry from
 	   user mode.  It is a fixed value over the lifetime of a process, or
 	   NULL for a kernel thread. */
 	struct pt_regs *uregs;

 	unsigned long trap_no, error_code;
 	unsigned long address;
 	/* Hardware debugging registers may come here */

 	/* floating point info */
 	union sh_fpu_union fpu;
 };

 #define INIT_MMAP \
 { &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }

 extern  struct pt_regs fake_swapper_regs;

 #define INIT_THREAD  {				\
 	.sp		= sizeof(init_stack) +	\
 			  (long) &init_stack,	\
 	.pc		= 0,			\
         .kregs		= &fake_swapper_regs,	\
 	.uregs	        = NULL,			\
 	.trap_no	= 0,			\
 	.error_code	= 0,			\
 	.address	= 0,			\
 	.fpu		= { { { 0, } }, }	\
 }

 /*
  * Do necessary setup to start up a newly executed thread.
  */
 #define SR_USER (SR_MMU | SR_FD)

 #define start_thread(regs, new_pc, new_sp) 	 		\
 	set_fs(USER_DS);			 		\
 	regs->sr = SR_USER;	/* User mode. */ 		\
 	regs->pc = new_pc - 4;	/* Compensate syscall exit */	\
 	regs->pc |= 1;		/* Set SHmedia ! */		\
 	regs->regs[18] = 0;   		 	 		\
 	regs->regs[15] = new_sp

 /* Forward declaration, a strange C thing */
 struct task_struct;
 struct mm_struct;

 /* Free all resources held by a thread. */
 extern void release_thread(struct task_struct *);
 /*
  * create a kernel thread without removing it from tasklists
  */
 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);


 /* Copy and release all segment info associated with a VM */
 #define copy_segments(p, mm)	do { } while (0)
 #define release_segments(mm)	do { } while (0)
 #define forget_segments()	do { } while (0)
 #define prepare_to_copy(tsk)	do { } while (0)
 /*
  * FPU lazy state save handling.
  */

 static inline void release_fpu(void)
 {
 	unsigned long long __dummy;

 	/* Set FD flag in SR */
 	__asm__ __volatile__("getcon	" __SR ", %0\n\t"
 			     "or	%0, %1, %0\n\t"
 			     "putcon	%0, " __SR "\n\t"
 			     : "=&r" (__dummy)
 			     : "r" (SR_FD));
 }

 static inline void grab_fpu(void)
 {
 	unsigned long long __dummy;

 	/* Clear out FD flag in SR */
 	__asm__ __volatile__("getcon	" __SR ", %0\n\t"
 			     "and	%0, %1, %0\n\t"
 			     "putcon	%0, " __SR "\n\t"
 			     : "=&r" (__dummy)
 			     : "r" (~SR_FD));
 }

 /* Round to nearest, no exceptions on inexact, overflow, underflow,
    zero-divide, invalid.  Configure option for whether to flush denorms to
    zero, or except if a denorm is encountered.  */
 #if defined(CONFIG_SH64_FPU_DENORM_FLUSH)
 #define FPSCR_INIT  0x00040000
 #else
 #define FPSCR_INIT  0x00000000
 #endif

 /* Save the current FP regs */
 void fpsave(struct sh_fpu_hard_struct *fpregs);

 /* Initialise the FP state of a task */
 void fpinit(struct sh_fpu_hard_struct *fpregs);

 extern struct task_struct *last_task_used_math;

 /*
  * Return saved PC of a blocked thread.
  */
 #define thread_saved_pc(tsk)	(tsk->thread.pc)

 extern unsigned long get_wchan(struct task_struct *p);

 #define KSTK_EIP(tsk)  ((tsk)->thread.pc)
 #define KSTK_ESP(tsk)  ((tsk)->thread.sp)

 #define cpu_relax()	barrier()

 #endif	/* __ASSEMBLY__ */
 #endif /* __ASM_SH64_PROCESSOR_H */
	#ifndef __ASM_SH64_PROCESSOR_H
	#define __ASM_SH64_PROCESSOR_H

	/*
	* This file is subject to the terms and conditions of the GNU General Public
	* License. See the file "COPYING" in the main directory of this archive
	* for more details.
	*
	* include/asm-sh64/processor.h
	*
	* Copyright (C) 2000, 2001 Paolo Alberelli
	* Copyright (C) 2003 Paul Mundt
	* Copyright (C) 2004 Richard Curnow
	*
	*/

	#include <asm/page.h>

	#ifndef __ASSEMBLY__

	#include <asm/types.h>
	#include <asm/cache.h>
	#include <asm/registers.h>
	#include <linux/threads.h>
	#include <linux/compiler.h>

	/*
	* Default implementation of macro that returns current
	* instruction pointer ("program counter").
	*/
	#define current_text_addr() ({ \
	void *pc; \
	unsigned long long __dummy = 0; \
	__asm__("gettr tr0, %1\n\t" \
	"pta 4, tr0\n\t" \
	"gettr tr0, %0\n\t" \
	"ptabs %1, tr0\n\t" \
	:"=r" (pc), "=r" (__dummy) \
	: "1" (__dummy)); \
	pc; })

	/*
	* CPU type and hardware bug flags. Kept separately for each CPU.
	*/
	enum cpu_type {
	CPU_SH5_101,
	CPU_SH5_103,
	CPU_SH_NONE
	};

	/*
	* TLB information structure
	*
	* Defined for both I and D tlb, per-processor.
	*/
	struct tlb_info {
	unsigned long long next;
	unsigned long long first;
	unsigned long long last;

	unsigned int entries;
	unsigned int step;

	unsigned long flags;
	};

	struct sh_cpuinfo {
	enum cpu_type type;
	unsigned long loops_per_jiffy;

	char hard_math;

	unsigned long *pgd_quick;
	unsigned long *pmd_quick;
	unsigned long *pte_quick;
	unsigned long pgtable_cache_sz;
	unsigned int cpu_clock, master_clock, bus_clock, module_clock;

	/* Cache info */
	struct cache_info icache;
	struct cache_info dcache;

	/* TLB info */
	struct tlb_info itlb;
	struct tlb_info dtlb;
	};

	extern struct sh_cpuinfo boot_cpu_data;

	#define cpu_data (&boot_cpu_data)
	#define current_cpu_data boot_cpu_data

	#endif

	/*
	* User space process size: 2GB - 4k.
	*/
	#define TASK_SIZE 0x7ffff000UL

	/* This decides where the kernel will search for a free chunk of vm
	* space during mmap's.
	*/
	#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)

	/*
	* Bit of SR register
	*
	* FD-bit:
	* When it's set, it means the processor doesn't have right to use FPU,
	* and it results exception when the floating operation is executed.
	*
	* IMASK-bit:
	* Interrupt level mask
	*
	* STEP-bit:
	* Single step bit
	*
	*/
	#define SR_FD 0x00008000

	#if defined(CONFIG_SH64_SR_WATCH)
	#define SR_MMU 0x84000000
	#else
	#define SR_MMU 0x80000000
	#endif

	#define SR_IMASK 0x000000f0
	#define SR_SSTEP 0x08000000

	#ifndef __ASSEMBLY__

	/*
	* FPU structure and data : require 8-byte alignment as we need to access it
	with fld.p, fst.p
	*/

	struct sh_fpu_hard_struct {
	unsigned long fp_regs[64];
	unsigned int fpscr;
	/* long status; * software status information */
	};

	#if 0
	/* Dummy fpu emulator */
	struct sh_fpu_soft_struct {
	unsigned long long fp_regs[32];
	unsigned int fpscr;
	unsigned char lookahead;
	unsigned long entry_pc;
	};
	#endif

	union sh_fpu_union {
	struct sh_fpu_hard_struct hard;
	/* 'hard' itself only produces 32 bit alignment, yet we need
	to access it using 64 bit load/store as well. */
	unsigned long long alignment_dummy;
	};

	struct thread_struct {
	unsigned long sp;
	unsigned long pc;
	/* This stores the address of the pt_regs built during a context
	switch, or of the register save area built for a kernel mode
	exception. It is used for backtracing the stack of a sleeping task
	or one that traps in kernel mode. */
	struct pt_regs *kregs;
	/* This stores the address of the pt_regs constructed on entry from
	user mode. It is a fixed value over the lifetime of a process, or
	NULL for a kernel thread. */
	struct pt_regs *uregs;

	unsigned long trap_no, error_code;
	unsigned long address;
	/* Hardware debugging registers may come here */

	/* floating point info */
	union sh_fpu_union fpu;
	};

	#define INIT_MMAP \
	{ &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ \| VM_WRITE \| VM_EXEC, 1, NULL, NULL }

	extern struct pt_regs fake_swapper_regs;

	#define INIT_THREAD { \
	.sp = sizeof(init_stack) + \
	(long) &init_stack, \
	.pc = 0, \
	.kregs = &fake_swapper_regs, \
	.uregs = NULL, \
	.trap_no = 0, \
	.error_code = 0, \
	.address = 0, \
	.fpu = { { { 0, } }, } \
	}

	/*
	* Do necessary setup to start up a newly executed thread.
	*/
	#define SR_USER (SR_MMU \| SR_FD)

	#define start_thread(regs, new_pc, new_sp) \
	set_fs(USER_DS); \
	regs->sr = SR_USER; /* User mode. */ \
	regs->pc = new_pc - 4; /* Compensate syscall exit */ \
	regs->pc \|= 1; /* Set SHmedia ! */ \
	regs->regs[18] = 0; \
	regs->regs[15] = new_sp

	/* Forward declaration, a strange C thing */
	struct task_struct;
	struct mm_struct;

	/* Free all resources held by a thread. */
	extern void release_thread(struct task_struct *);
	/*
	* create a kernel thread without removing it from tasklists
	*/
	extern int kernel_thread(int (fn)(void ), void * arg, unsigned long flags);


	/* Copy and release all segment info associated with a VM */
	#define copy_segments(p, mm) do { } while (0)
	#define release_segments(mm) do { } while (0)
	#define forget_segments() do { } while (0)
	#define prepare_to_copy(tsk) do { } while (0)
	/*
	* FPU lazy state save handling.
	*/

	static inline void release_fpu(void)
	{
	unsigned long long __dummy;

	/* Set FD flag in SR */
	__asm__ __volatile__("getcon " __SR ", %0\n\t"
	"or %0, %1, %0\n\t"
	"putcon %0, " __SR "\n\t"
	: "=&r" (__dummy)
	: "r" (SR_FD));
	}

	static inline void grab_fpu(void)
	{
	unsigned long long __dummy;

	/* Clear out FD flag in SR */
	__asm__ __volatile__("getcon " __SR ", %0\n\t"
	"and %0, %1, %0\n\t"
	"putcon %0, " __SR "\n\t"
	: "=&r" (__dummy)
	: "r" (~SR_FD));
	}

	/* Round to nearest, no exceptions on inexact, overflow, underflow,
	zero-divide, invalid. Configure option for whether to flush denorms to
	zero, or except if a denorm is encountered. */
	#if defined(CONFIG_SH64_FPU_DENORM_FLUSH)
	#define FPSCR_INIT 0x00040000
	#else
	#define FPSCR_INIT 0x00000000
	#endif

	/* Save the current FP regs */
	void fpsave(struct sh_fpu_hard_struct *fpregs);

	/* Initialise the FP state of a task */
	void fpinit(struct sh_fpu_hard_struct *fpregs);

	extern struct task_struct *last_task_used_math;

	/*
	* Return saved PC of a blocked thread.
	*/
	#define thread_saved_pc(tsk) (tsk->thread.pc)

	extern unsigned long get_wchan(struct task_struct *p);

	#define KSTK_EIP(tsk) ((tsk)->thread.pc)
	#define KSTK_ESP(tsk) ((tsk)->thread.sp)

	#define cpu_relax() barrier()

	#endif /* __ASSEMBLY__ */
	#endif /* __ASM_SH64_PROCESSOR_H */